<template>
    <div>
        <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
    <!-- 2.为ECharts准备一个具备大小（宽高）的Dom -->
    <div id="main" style="width: 1100px;height:550px;"></div>
    </el-card>
    </div>
</template>
<script>
 // 1. 导入 echarts
import echarts from 'echarts'
import _ from 'lodash'
export default {  
    data(){
        return{
             // 需要合并的数据
      options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
           type: 'value'
          }
        ]
      }
    }
  },
    created(){},    
// 此时，页面上的元素，已经被渲染完毕了！
  async  mounted(){
          // 3.基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'))
        // 请求数据
        const { data: res } = await this.$http.get('reports/type/1')
           if (res.meta.status !== 200) {return this.$message.error('获取折线图数据失败！')}
        // 4.准备数据和配置项,
        // merge:lodash提供的将2个数据合并的方法
         const result= _.merge(res.data,this.options)      
        // 5.展示数据
        myChart.setOption(result);
    },
    methods: {},
}
</script>
<style  scoped>

</style>